#3-Austin Dillon was fastest during opening practice at Iowa Speedway with a speed of 134.765mph. #29-Kenny Wallace was second, followed by: #32-Kyle Larson, #30-Nelson Piquet, Jr., #99-Alex Bowman, #60-Travis Pastrana, #54-Drew Herring, #20-Brian Vickers, #70-Johanna Long, and #11-Elliott Sadler. All 40 drivers practiced during the session. See complete results on the Iowa practice 1 speeds page (pdf) .
